Bicycle frame



FIG. 1 is a front and left side perspective view of my new design for a bicycle frame, shown in exploded condition;

FIG. 2 is a rear and right side perspective view thereof, shown in exploded condition;

FIG. 3 is a right side elevational view thereof, shown in exploded condition;

FIG. 4 is a top perspective view thereof, shown in exploded condition; and,

FIG. 5 is a top plan view thereof, shown in exploded condition. 

The ornamental design for a bicycle frame, as shown and described. 